Amir Weitz

Dianions and Tetraanions of Bowl-Shaped Fullerene Fragments Dibenzo[a,g]corannulene and Dibenzo[a,g]cyclopenta[kl]corannulene

The fullerene fragment 1 (C28H14) gives a paratropic dianion and a diatropic tetraanion on alkali metal reduction, whereas the C30H14 hydrocarbon 2, which contains just one more ring from the C60 network, gives a diatropic dianion and a paratropic tetraanion.

Reduction of 1, 3, 5, 7, 9-penta-t-butyl-corannulene: Isomeric sandwiches with multiple lithium cations inside and out

Abstract Four reduction stages were observed for 1, 3, 5, 7, 9-penta-t-Bu-corannulene(2), two of which exhibited diamagnetic character: a paratropic dianion 2 2− and a diatropic tetraanion 2 4− . In the last stage of reduction three distinct tetraionic species are detected. Two of them are sandwhich-type compounds with eight Li cations each and a tetraionic monomer.

Toward ferromagnetic materials: prediction of a triplet ground state for heterocyclic polyacenes

Abstract Bis-1,2,4-triazines were explored as potential ground-state triplet molecules which might serve as components of ferromagnetic materials. Relationships between numbers of rings and singlet–triplet gaps were explored by hybrid density functional theory for a series of heterocyclic polyacenes. Available X-ray structures of bis-triazines are compared to computed model compounds and used to check the methodology. A hexacyclic bis-1,2,4-triazine is predicted to have a triplet ground state.

Reduction of polycyclic hydrocarbons with potassium-graphite intercalate KC8

Abstract Aromatic polycyclic hydrocarbons were reduced by potassium-graphite intercalate KC8 to give 4nπ anti-aromatic systems. The reduction process was followed by nuclear magnetic resonance (NMR) and was compared to the reduction process with potassium metal. The latter allowed insight into the reaction mechanism of KC8.

H-1 NMR of C61H26-: the aromatic character of C-60 upon reduction - a view from the bridge of C61H2

The 1H NMR spectrum of the fulleroid C61H26– consists two high field doublets, providing experimental evidence for diamagnetic five-membered rings in C606–.